Cushion-tire.



L .GAMMETER GUSHQN URE.

Awucmox man Die. n. 2912.

Patented Mar. 14, 1916.

UNTED STATES PAET FFCE.

JOHN R. GAMMETER, OF AKRN, OH, ASS1GNQR T THE F. GOODRICH COMPANY, 0F NEW YORK, N. Y., A CBPOBATIGN 0F ITEWv YGRK.

To all who? z't moy concern.

Be it known that I, JOHN R. GAMMLTEB,

citizen 'lof the United States, residing at Akron, in the county of Summit and State of @hichave invented certain new and use ful improvements in Cushion-Tires, of which the following is a specification.

My present invention pertains to cushion tires, adapted for use more especially in connection with motor trucks, and the mein object of the invention is to produce a dw roble tire, which, while having suicient resiliency, will likewise present a tread eurface which will aii'ord suliicient traction under both normal and abnormal road conditions.

T he tire is shown in the annexed drewings, wherein- Figure 1 is e perspective view of a pon tion of the tire; Fig. 2 a transverse sectional view of the tread portion; and Fig. 5 a top plan view thereof.

The base or main body of the tire is desig noted by 1 and may be of any desired form according to the construction of the rim or wheel to which it is'to be secured.

The central portion, or what. may be termed the body .of the tire, designated by 2, is somewhat narrower than the base and is surmounted by two rounded tread members 3 and 3, which overhang the side walls of the body proper. Stated in another way, it maybe said that each side of the tire is undercut beneath the tread, or that each side isf'forlned with la continuous rounded depression intermediate the base and the tread."

Each of the treed members ci' 3 and 3i is rounding, being substantially, thoughv not necessarily, circuler in contour or outline, and separated from the other member to a slight extent, Where they merge into the upper portion of the tire-body 2, so as to Aproduce en intervening channel or groove 4, which is narrowest at its bottom. Projecting from each of the tread members, inwardly into said groove, and preferably in alternation from the opposite tread members, ere lugs or knobs 5, the knobs by preterence being of the form shown, that is, having a fiat top or outer fece which lies in ay plane coincident with the outer faces of the treed members, whie the waii Speciication of Letters Patent.

Patented Mar. 14, HMG,

Application le December M,- 1932. Serien Re. 7f,168.

which extends within the groove or channel not only do both of the tread surfaces proper beer upon the ground, but at least two or .iore of the lugs or knobs 5 (depending, of course, upon how they likewise heer upon the ground, tlierebgiI not only increasing traction by reason of the additional surface which they present, but

ere spaced) aise, owing to their edges which stand trans- 'l e verse to the line of traction, causing the tire to grip the surface. Said lugs or` knobs, when collectively considered, may be S11-id to bridge the centrally-disposed groove Vor channel Li, and thus prevent the'edge of a rail or the like from passing into said groove; or, if perchance, a rail should be forced into the same, the knobs tend to lift the wheel and assist it to ride od of the rail- Again, when there is e tendency to skid, and a. consequent lateral displacement of the tread sections 3, 3, such displacement or roclolngr motion of the sections will cause the knobs'upon what may be terined the trailing tread to be thrown downwerdiy, causing their edges to bite into the surface. This will be readily appreciated upon reference to the dotted-line position of the parts in Fig. 2, it being assumed, that the tire is slridding in the direction indicated by the arrow, and that the section 3*l is the trailing section.

asweli other advantages, it Wili readily Vclear itself of adheringr mud and the like.

Iinitial cut,.as where the treads themselves are notched.

Having thus described my invention, wha? I claim is;

l. tire-treed, presenting tno treed surfaces, with a series of rated.

Moreover, While the tire pre-v sente eli the advantages of epoclreted trend,

tending from said surfaces iiito the grooveor channel located between 'the same, said knobs at their ends terminating short of the adjacent tread surfaces.

2. A tire-t| rea,d,.A presenting two separated tread surfaces, with 'a series of knobs extending in alternation from said surfaces into the groove or channel located between the same.

3. A tire, comprising` a base surmoiinted by a relativelynarrow body portion havinga pair of rounded treads formed asextensions of said body portion, the treads being separated and projecting laterally Ibeyond the side walls of the body portion; and a plurality of lugs projecting in alternation from the adjacent side walls'of the treads, and each terminating short Aof the opposite wall.

4. A tire, having two separated tread portions, and a series ofprojections extending in alternation from the adjacent walls thereof, whereby a sinuous groove or chan nel will be formed between said tread portions.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHNl R. GAMMETER.

Witnesses ROBERT M. PIERSON, VALTER K. MEANS. 

